Kyle Shrubline VFI
P a d m o u n t e d Va c u u m F a u l t I n t e r r u p t e r
Overcurrent Protection For Underground Residential Distribution Systems
Resettable Fault Protection through 25kV
Deadfront Construction for Safety
•
•
•
•
•
No Fuses To Replace
No Special To o l s
Fast Service Restoration
Resettable Breaker Operation
Breaker Doubles As An
Open/Close Load-Break Switch
• Familiar Low Profile Design
Kyle Shrubline VFI
Safe - Efficient - Easy to Use
51.0
Dimensions
(inches)
36.3
34.0
6.0 8.75
16.0
T1
S1
20.0
69.2
35.0
10.5
30.7
1.5
1.5
29.7
34.0
1.5
1.5
13.5
Pentahead Bolt with
Padlockable Hasp
Nameplate
Operation One-Line
Diagram
One Piece Door Construction, for Ease of
Operation
Oil Fill Plug
Pressure Relief Valve
Oil Level Indicator
Parking Stands
200A Bushing
Wells Standard
Floating Lock Pocket
for Easy Engagement
Note: Elbows and bushing well inserts are not supplied.
2
VFI Tri-Phase
Control
VFI Operating Handle
Oil Drain Plug
Ground Provisions
Vacuum Fa ul t Inte rrupter
Overcurrent Protection with Circuit Breaker Ease and Speed
Shrubline VFI Padmount
Switchgear
Shrubline VFI, a Breaker “and” a Switch
The Shrubline VFI (Vacuum Fault Interrupter) represents the latest technology in
low profile URD Padmount Switchgear.
Overcurrent protection is accomplished
with Kyle ® vacuum interrupters instead
of fuses. The resettable breaker mechanism allows immediate service restoration, eliminating the added downtime and
expenses associated with changing out
conventional fuses.
The Shrubline VFI breaker also serves as
a vacuum load-break switch. Tap switching has traditionally been accomplished
by pulling load-break elbows, or by loadbusting fuses. With the Shrubline VFI,
the tap can be switched with a simple
push-pull of the operation handle.
Tri-Phase Control
The Shrubline VFI meets the switching
duty cycle requirements of ANSI C37.72
and the stringent interrupter duty cycle
requirements of ANSI C37.60. Shrubline
VFI also meets the enclosure integrity
and coating performance requirements of
ANSI C57.12.28.
The Tri-Phase electronic breaker control
sets a new standard for ease of Time-Current-Curve (TCC) coordination. Just like
Kyle’s time-proven recloser controls, the
Tri-Phase control offers over 100 minimum trip settings and an assortment of
time-current-curves. With standard instantaneous trip and optional minimum
response curves, the Tri-Phase control
will satisfy all of your coordination
needs.
Low Maintenance
The internal mechanisms and bus work
are insulated with mineral oil, which provides electrical insulation only. Both
load and fault interruption take place in
sealed vacuum interrupters.
ANSI Padmount
Switchgear Standards
Low Profile Sealed
Construction
Shrubline VFI utilizes the same familiar
time proven tank and enclosure currently
used by RTE Distribution Transformers.
The low profile design features a safe “no
sharp edges’” enclosure, making it safe
for residential applications. The low profile design is unobtrusive and aesthetically acceptable. The sealed tank
construction, like all Kyle padmount
switchgear, is immune to airborne contaminants and moisture which contaminate and degrade the insulation on
livefront and air-insulated switchgear.
Since there are no expulsion fuses or
switching by-products to contaminate the
insulation medium, maintenance intervals
are greatly increased.
Oil Level Indicators
Oil level indicators are provided on the
tank, inside the cable compartment, to
provide clear indication of proper oil
level within the switchgear.
For more details on the Tri-Phase Control, refer to VFI Bulletin 91041
3
Kyle Shrubline VFI
Applications
Introduction
The Kyle Shrubline VFI is specially
designed for use in Underground Residential Distribution (URD). From riser pole
to the end of a URD loop, the Shrubline
VFI offers practical and affordable advantages. Shrubline VFI replaces riser pole
fuses, provides intermediate “in-line” fault
protection, tap or “branch line” protection, protection for isolated loads, and
protection for normally open points in
loop-fed URD systems.
Examples
Refer to Figure 1 for examples of various
Shrubline VFI applications.
1 . 200A Riser Pole
Protection
Installed at the base of the riser pole, a
Shrubline VFI replaces the riser pole
fuse. Riser pole protection for singlephase tap lines is typically accomplished
with fused cutouts. Fuse selection can
result in improper coordination with
upline protective devices; or in some
cases, fuses can be selected which are not
sized properly to handle the dynamics of
the tap line load. In extreme situations,
the only traditional solution may be to
install a sectionalizing switch on the riser
pole and leave these taps virtually
unfused. In the cases where fuse size and
type are limited by the sensitivity of
upline devices, a Shrubline VFI with the
flexibility of the Tri-Phase control may
be an acceptable alternative.
It is sometimes necessary to provide service to isolated loads utilizing dedicated,
long extension “cross-country” taps.
Unprotected, the additional exposure
reduces the service reliability to all interconnected distribution lines. The
Shrubline VFI is an economical, reliable,
and maintenance-free means of individually protecting isolated loads.
3 . T- Taps and Three
Point Junctions
5 . Terminal Point
Protection (Retrofit)
Multiple tap lines from main 200A URD
single-phase circuits using 3-point splices
have been virtually eliminated in URD
systems. This is due primarily to the
inability to sectionalize these lines during
fault-chasing scenarios. Reductions in
overall reliability and increased outage
durations are typical operational hazards
of permanent “hard-wired” taps. While
above- ground separable connectors allow
manual sectionalizing during fault-chasing, the Shrubline VFI additionally provides overcurrent protection and
“localizes” the fault to assist in minimizing the outage area and the outage duration.
Switching and load transfers are often
required during routine operation of loopfed URD systems. As a result of these
transfers, both protective device loading
and protective device exposure are
increased. In mature URD developments,
these zones of protection can be maintained by installing Shrubline VFI at
locations where “permanent” normally
open points have been established.
ALTERNATE
OVERHEAD
FEED
OVERHEAD
FEED
2 . Intermediate Fault
Protection
1
“In-line” fault protection is now available
for long single-phase radial URD taps.
Radial URD single-phase taplines
3
2/
5
4
LOAD
Figure 1
URD One-line
4
4 . Individual Protection
for Isolated Loads
often do not have fault protective devices
applied at mid-point or at other strategic
intermediate points on the line. Primary
faults must be cleared by the riser fuse
and result in widespread outages. Service
restoration accomplished using manual
“fault-chasing” techniques can be cumbersome and time consuming. Properly
coordinated and suitably located, the
Shrubline VFI can effectively minimize
both outage area and outage duration.
1
Vacuum Fa ul t Inte rrupter
Simple, Money-Saving Substitute For Costly Fuse Systems
Coordination
The EF curve is provided as a standard and
is suitable for most applications. Four
optional curves (KF, TF, H, and F) are
also available to meet your coordination
requirements.
When standard curves miscoordinate, the
instantaneous trip feature, or one of the 5
minimum response accessories, can be
applied to modify or “shape” the TCC to
fit the requirements of the application.
TCCs with definite response times at
high fault currents, like the H and F
curves shown in Figure 2, can be used to
coordinate Shrubline VFI with upline
relay type devices as well as with downline Shrubline VFI. In Figure 2, an
upline device with an F-Curve at 130A
H Curve at 100A minimum trip. These
settings could be applied to Shrublines 1
and 3 or 1 and 4 in Figure 1.
Coordination and application of the TriPhase control is identical to fuse application, but with the benefit of a greatly
expanded offering of trip ratings and timing curves.
In Figure 3, the EF TCC provides ideal
coordination when protecting single-phase
1000
EF-TCC
100A
Min. Trip
100
Composite:
50A ELSP &
15A Bayonet
T 10
I
M
E
1
Single-phase
URD transformer
protection.
400A GND
1200A Phase
0.10
1000
Shrubline VFI
with H & F TCCs
C09-400A GND
0.010
100
1
CO9
1200A PHASE
T 10
I
M
E
1
VFI-100A
H-TCC
VFI-130A
F-TCC
0.010
10
100
1000
10
100
1000
10000
100000
10000
100000
CURRENT
Figure 2
Shrubline VFI with H and F
TCCs
minimum trip works with both the
upline substation breaker or recloser and
the downline Shrubline VFI with an
1000
TF-TCC
130A Min. Trip
CURRENT
Figure 3
Single-phase URD transformer
protection
0.10
1
Shrubline VFI can sense and clear 12kA
fault currents in two cycles. This works
well with upline substation breakers or
reclosers which typically operate in 3-5
cycles, and downline expulsion fuses
which can operate in 0.5 to 1.0 cycle.
For optimum coordination with upline
fuses and downline VFI, TCCs must be
matched for each application to prevent
simultaneous operation of the fuse and
the VFI. In Figure 4, midline and downline Shrublines coordinate with each other
through 12kA. However, the midline
Shrubline only coordinates with the
upline 100A T-link fuse at the riser pole
up through 2300A; while the downline
Shrubline coordinates with that same
100A T-link fuse up through 3885A.
These settings are applicable for VFIs
beyond fused riser poles like Shrublines
1, 3, and 4 of Figure 1 (substitute fuses
for switches in Figure 1).
distribution transformer loop schemes.
The cable and transformer can be protected
to rated load with ample margin between
the EF and the upline recloser.
The Shrubline VFI, used with the control features and accessories, provides an
economical solution to virtually any
problem which arises when planning the
application of protective devices for URD
systems.
TF-TCC
100A Min.Trip
100
Shrubline VFI to
Fuse Coordination
100A
T-Link Fuse
T 10
I
M
E
1
0.10
0.010
1
10
100
1000
10000
100000
CURRENT
Figure 4
Shrubline VFI in Fuse Coordination
5
Kyle Shrubline VFI
Options and Accessories
The TCCs in Figure 6 shows coordination between three devices with TF
TCCs. Note that minimum trip settings
are chosen to simulate 50A, 65A, and
80A rated devices. Miscoordination
Tri-Phase Control
Accessories
Minimum Response Time
The minimum response time accessory is
used to achieve coordination between inline protective interrupting devices, located where fault-current levels would
normally cause simultaneous tripping.
1000
3 Shrubline VFI
w/standard TCC
Minimum Response
Time Accessory
100
TF-TCC
130A Min. Trip
Typical
Response
Curve
10
100
10
100
1000
10000
100000
CURRENT
1000
10000
100000
CURRENT
Figure 5
M i n i m u m R e s p o n s e T i m e A c c e ssory
The accessory inhibits tripping until a
predetermined (user selectable) minimum
time has elapsed; available minimum
response times are 0.050, 0.100, 0.145,
0.205, 0.260, 0.335, 0.405, 0.495, or
0.580 seconds; time selection is made
with a convenient slide switch. The
example shown in Figure 5 demonstrates
a response curve modified by Minimum
Response.
6
100
1000
10000
100000
Figure 7
Shrubline VFI with Minimum
Response
Figure 6
Shrubline VFI with Standard
TCC
1
10
CURRENT
1
0.010
TF-TCC
160A Min. Trip
0.58s Min.
Response
TF-TCC
100A Min. Trip
1
0.010
0.10
T 10
I
M
E
1
0.010
TF-TCC
100A Min. Trip
TF-TCC
160A Min. Trip
Minimum
Response
Time
100
0.10
0.10
T 10
I
M
E
1
Shrubline VFI
w/Min. Response
TF-TCC
130A Min. Trip
0.205s Min.
Response
100
T 10
I
M
E
1
1000
1000
occurs at times below 0.07 seconds. This
miscoordination can be corrected by
applying the minimum response accessory to each device as shown in Figure 7.
Minimum response selections of 0.58
seconds for the 160A minimum trip and
0.205 seconds for the 130A minimum
trip can be applied.
Vacuum Fault Interrupter
Ordering Information
• Single-Phase • 14.4 and 24.9kV Nominal
• 200 Amp Max Continuous • 12000 Amp
Interrupting Rating
KSHRUB1 - Basic letters for a 15/25kV Kyle Shrubline VFI
with 200A bushings.
1 Insulating Medium
1 - oil (standard)
2 - R-Temp*
1 Tank and Cabinet Construction
1 - Mild Steel (standard)
2 - Stainless Steel*
How To Order
To order a Kyle Shrubline VFI:
1. Use the chart at right to construct a catalog number that
describes the required basic construction.
2. From Tables 1 and 2, specify the catalog numbers for the
time-current curves and bushing inserts.
3 Standard unit includes 200A wells only.
KSHRUB1
*Non-standard items require longer leadtimes.
TABLE 3 Accessories
(One TCC per control required)
KPA-TCC-EF (standard)
KPA-TCC-F* *
KPA-TCC-H* *
KPA-TCC-KF* *
KPA-TCC-TF* *
Minimum Response
TCCs
KPA-MINR-EF* *
KPA-MINR-F* *
KPA-MINR-H* *
KPA-MINR-KF* *
*Default settings: EF Timing Card, 80A Min. Trip;
Instantaneous Trip OFF.
**Ordered in place of standard TCC card.
TABLE 2 Bushing Inserts*
Catalog
Number
Description
Catalog Number
Ground Rod
KPA-1037-2
Operations Counter
KPA-113-7
ExamVoltage
(kV)
One-Line
Diagram
Item
1
200A
200A
S
T
2
KSHRUB111
15
200A
200A
S
T
KSHRUB111
25
200A
and
KSHRUB111
15kV
200A
S
T
15
200A
Single inserts source and tap
Single inserts source, feedthru insert tap
Feedthru insert source and tap
Feedthru insert source, single insert tap
and
KPA-1036-1*
Description
Single inserts source and tap
Single inserts source, feedthru insert tap
Feedthru insert source and tap
Feedthru insert source, single insert tap
Catalog
Number
KPA-1035-1*
3
15kV
KPA-1035-1
KPA-1035-2
KPA-1035-3
KPA-1035-4
25kV
KPA-1036-1
KPA-1036-2
KPA-1036-3
KPA-1036-4
1
KSHRUB111 is the catalog number for the basic Kyle
Shrubline VFI.
TABLE 1 Time-Current Curve Cards*
Fixed TCCs
1
200A
4
S
200A
and
KPA-1035-4*
25kV
KSHRUB111
200A
T
25
200A
and
KPA-1036-3*
*Bushings and feedthru inserts are optional.
For additional product and application information, contact
your local Cooper Power Systems representative.
*Standard unit is supplied with 200 Amp bushing wells only
7
K y le Shrubline VFI
Features & Benefits:
Resettable Breaker-Type Operation
• No fusing expense
• No spare fuses to keep on trucks or in stock
• Eliminates installation of wrong replacement fuses
• Can be used to de-energize tap prior to elbow
removal, thus extending elbow life
Adjustable Minimum Trip Ratings and
Time-Current Curves
• Current ratings can be changed to accommodate
load changes
• Minimize inventory of components
• Shorter downtime for service restoration
• Trip settings can be adjusted without de-energizing
customers
• Visual indication of faulted tap
• Increased system protection for larger loads
• Breaker doubles as an open/close switch
• Large selection of TCCs for precise coordination
Sealed Deadfront Construction
Compact Size
• Meets padmount switchgear standard ANSI
C37.72, which requires deadfront construction for
safety
• Sealed oil insulated design allows compact
construction through 25 kV
• Meets ANSI C37.60 for fault interrupter duty
• Low profile familiar design for residential applications
• Meets ANSI C57.12.28 enclosure integrity and
coating performance requirements
• Non-vented design allows for application in high
contaminant environments
• Sealed tank eliminates catastrophic failure due to
flood immersion
The Quality System at Cooper Power Systems,
Kyle Distribution Switchgear is ISO9001 Certified
© 1999 Cooper Power Systems, Inc.
® Kyle is a Registered Trademark of Cooper Industries, Inc.
Bulletin 94001 • July 1999 • Supersedes March 1994
File: Catalog 285-15
P.O. Box 1640
Waukesha, WI 53187
www.cooperpower.com
KTM
7/99